Hi Rianna, I’m sorry your having a worry about your meds...Remeron is a Tetracyclic so your physician isn’t going to want to pair it with the older Tricyclics due to a possible chemical clash. Wellbutrin and Effexor are SSRI's and would most likely give a good boost to the Remeron...this is why physicians typically stack the SSRI's on top of this class of medications. It is difficult to try to trust what your physician is doing, I know. But your very good about keeping yourself informed of these meds and just be sure that you ask lots of questions from your doctor before hand.
After working for a large mental health organization I can tell you that psychiatrists don’t get paid by the drug companies or drug reps to prescribe any of these medications. The most I have ever seen given out by the drug reps and drug companies is pens, note pads, book bags, sometimes if there was a training on that medication they would supply breakfast or lunch. Just small stuff like that.